Transcript
74VHCT138A 3-to-8 Decoder/Demultiplexer
tm
Features
General Description
■ High Speed: tPD = 7.6ns (Typ.) at VCC = 5V ■ Low power dissipation: ICC = 4µA (Max.) at TA = 25°C
The VHCT138A is an advanced high speed CMOS 3-to-8 DECODER fabricated with silicon gate CMOS technology. It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation.
■ Power down protection is provided on all inputs and
outputs Pin and function compatible with 74HCT138 ■
When the device is enabled, 3 Binary Select inputs (A0, A1 and A2) determine which one of the outputs (O0–O7) will go LOW. When enable input E3 is held LOW or either E1 or E2 is held HIGH, decoding function is inhibited and all outputs go HIGH. E3, E1 and E2 inputs are provided to ease cascade connection and for use as an address decoder for memory systems. Protection circuits ensure that 0V to 7V can be applied to the input pins without regard to the supply voltage and to the output pins with VCC = 0V. These circuits prevent device destruction due to mismatched supply and input/output voltages. This device can be used to interface 3V to 5V systems and two supply systems such as battery backup.
Ordering Information Order Number
Package Number
Package Description
74VHCT138AM
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
74VHCT138ASJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74VHCT138AMTC
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering number.
©1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com
74VHCT138A 3-to-8 Decoder/Demultiplexer
May 2007
74VHCT138A 3-to-8 Decoder/Demultiplexer
Connection Diagram
Logic Symbols IEEE/IEC
Pin Description Pin Names
Description
A0–A2
Address Inputs
E1–E2
Enable Inputs
E3
Enable Input
O0–O7
Outputs
Truth Table Inputs
Outputs
E1
E2
E3
A0
A1
A2
O0
O1
O2
O3
O4
O5
O6
O7
H
X
X
X
X
X
H
H
H
H
H
H
H
H
X
H
X
X
X
X
H
H
H
H
H
H
H
H
X
X
L
X
X
X
H
H
H
H
H
H
H
H
L
L
H
L
L
L
L
H
H
H
H
H
H
H
L
L
H
H
L
L
H
L
H
H
H
H
H
H
L
L
H
L
H
L
H
H
L
H
H
H
H
H
L
L
H
H
H
L
H
H
H
L
H
H
H
H
L
L
H
L
L
H
H
H
H
H
L
H
H
H
L
L
H
H
L
H
H
H
H
H
H
L
H
H
L
L
H
L
H
H
H
H
H
H
H
H
L
H
L
L
H
H
H
H
H
H
H
H
H
H
H
L
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
©1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 2
74VHCT138A 3-to-8 Decoder/Demultiplexer
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
©1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 3
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.
Symbol
Parameter
Rating
VCC
Supply Voltage
–0.5V to +7.0V
VIN
DC Input Voltage
–0.5V to +7.0V
VOUT
DC Output Voltage Note 1
–0.5V to 7.0V
Note 2
–0.5V to VCC + 0.5V
IIK
Input Diode Current
–20mA
IOK
Output Diode Current(3)
±20mA
IOUT
DC Output Current
±25mA
ICC
DC VCC / GND Current
TSTG TL
±75mA
Storage Temperature
–65°C to +150°C
Lead Temperature (Soldering, 10 seconds)
260°C
Recommended Operating Conditions(4) The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings.
Symbol
Parameter
VCC
Supply Voltage
VIN
Input Voltage
VOUT
Rating 4.5V to +5.5V 0V to +5.5V
Output Voltage Note 1
0V to 5.5V
Note 2 TOPR
Operating Temperature
t r, t f
Input Rise and Fall Time, VCC = 5.0V ±0.5V
0V to VCC –40°C to +85°C 0 ∼ 20ns/V
Notes: 1. VCC = 0V. 2. HIGH or LOW state. IOUT absolute maximum rating must be observed. 3. VOUT < GND, VOUT > VCC (Outputs Active). 4. Unused inputs must be held HIGH or LOW. They may not float.
©1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 4
74VHCT138A 3-to-8 Decoder/Demultiplexer
Absolute Maximum Ratings
TA = –40°C to +85°C
TA = 25°C Symbol
Parameter
VIH
HIGH Level Input Voltage
4.5 – 5.5
VIL
LOW Level Input Voltage
4.5 – 5.5
VOH
HIGH Level Output Voltage
4.5
LOW Level Output Voltage
4.5
VOL
VCC (V)
Min.
Conditions
Typ. Max. Min. Max. Units
2.0
2.0 0.8
VIN = VIH IOH = –50µA or VIL IOH = –8mA
4.4
4.5
4.4
3.94
VIN = VIH IOL = 50µA or VIL IOL = 8mA
V 0.8
V V
3.80 0.0
0.1
0.1
V
0.36
0.44
0 – 5.5
VIN = 5.5V or GND
±0.1
±1.0
µA
Quiescent Supply Current
5.5
VIN = VCC or GND
4.0
20.0
µA
ICCT
Maximum ICC / Input
5.5
VIN = 3.4V, All other inputs = VCC or GND
1.35
1.50
mA
IOFF
Output Leakage Current
VOUT = 5.5V
0.5
5.0
µA
IIN
Input Leakage Current
ICC
0
AC Electrical Characteristics TA = –40°C to +85°C
TA = 25°C Symbol tPLH, tPHL tPLH, tPHL tPLH, tPHL
Parameter
VCC (V)
Conditions
Min.
Typ.
Max.
Min.
Max.
Units ns
Propagation Delay, An to On
5.0 ± 0.5 CL = 15pF
7.6
10.4
1.0
12.0
CL = 50pF
8.1
11.4
1.0
13.0
Propagation Delay, E3 to On
5.0 ± 0.5 CL = 15pF
6.6
9.1
1.0
10.5
CL = 50pF
7.1
10.1
1.0
11.5
Propagation Delay, E1 or E2 to On
5.0 ± 0.5 CL = 15pF
7.0
9.6
1.0
11.0
CL = 50pF
7.5
10.6
1.0
12.0
4
10
CIN
Input Capacitance
CPD
Power Dissipation Capacitance
VCC (5)
= Open
10
49
ns ns pF pF
Note: 5. CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average operating current can be obtained by the equation: ICC (Opr.) = CPD • VCC • fIN + ICC
©1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 5
74VHCT138A 3-to-8 Decoder/Demultiplexer
DC Electrical Characteristics
74VHCT138A 3-to-8 Decoder/Demultiplexer
Physical Dimensions Dimensions are in millimeters unless otherwise noted.
Figure 1. 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Package Number M16A
©1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 6
74VHCT138A 3-to-8 Decoder/Demultiplexer
Physical Dimensions (Continued) Dimensions are in millimeters unless otherwise noted.
Figure 2. 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D
©1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 7
5.00±0.10 4.55 5.90 4.45 7.35 0.65
4.4±0.1
1.45
5.00 0.11
12°
MTC16rev4
Figure 3. 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC16
©1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 8
74VHCT138A 3-to-8 Decoder/Demultiplexer
Physical Dimensions (Continued) Dimensions are in millimeters unless otherwise noted.
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2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification
Product Status
Definition
Advance Information
Formative or In Design
This datasheet contains the design specifications for product development. Specifications may change in any manner without notice.
Preliminary
First Production
This datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design.
No Identification Needed
Full Production
This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design.
Obsolete
Not In Production
This datasheet contains specifications on a product that has been discontinued by Fairchild Semiconductor. The datasheet is printed for reference information only. Rev. I27
©1993 Fairchild Semiconductor Corporation 74VHCT138A Rev. 1.2
www.fairchildsemi.com 9
74VHCT138A 3-to-8 Decoder/Demultiplexer
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